Furnace construction



' Dec. 14, 1926.

W. G. WISE FURNACE CONSTRUCTION Filed Jan. 5. 1926 05 T5 MM a m m M M A TTORNE Y.

Patented Dec. 14, 1926.

anna Parent orrica.

rid-Inseam G. men, or AKRON, OHIO.

FURNACE ooivsrnu men.

Application filed January 5 1926. Serial No. 79,413.

This invention relates to furnaces, and particularly to furnaces of the coal burning, hot air type for use in domestic heating, although it is not necessarily limited to that particular type of furnace, but may be extended to other uses.

The object of the invention is to provide for more complete and e'l'licient combustion of the fuel within the furnace by the introduction of air heated by circulation through passageways in the usual fire pot, he apparatus being constructed to provide a more efiicient introduction of the heated air over the fire to secure a more complete :ornbustion of the coal'and the gases-given olt during the burning of the coal. I-Ierete-fore, arrangements have been devised for securing the circulation of heated air through the walls of the fire pot, but all such arrangements known to me have delivered the hot air directly within the bed of coals, whereas the object of the present invention is the delivery of air, heated by the combustion within the fire pot to the top of the fire, so that the smoke and gases will be more thoroughly consumed and a hotter and more efficient fire will be obtained.

The drawings and description relate to one form of the invention, it being understood that changes and modifications may be made within the scope of the invention as set forth in the claim.

In the drawings:

Figure 1 is a perspective view of the preferred embodiment of the invention as applied to a hot air furnace of the coal burning domestic type;

Figure 2 is a view of the fire pot looking from the underside;

Figure 3 is a plan view of the fire pot;

Figure 4 is a cross section on the line 4-4 of Figure 3; and

Figures 5 and 6 are details of the fire pot.

In the drawings, referring particularly to Figurel, the usual furnace construction is shown, except in so far as modified by my invention. The furnace is built up of a number of cast iron sections which are arranged one above the other, the sections being designated as the ash-pit section 1, the fire pot 2, the feed section 3 and the dome or radiator 4. 5 indicates the ring support and 6 the sheet metal casing which is seated thereon and surrounds the furnace, the usual smoke pipes being indicated by the numeral 7.

Each section of the furnace is provided with a groove around its upper edge in which the lower edge of the next adjacent furnace section rests, the construction being the same as in prior furnaces except wherein the fire pot has been modified, as will be described.

The invention has particularly to do with the construction and operation of the fire pot section 2. This section consists of a heavy casting which tapers toward its lower edge and is formed with a plurality of deep vertical grooves 10, which are substantially semi-circular, being closed in slightly along their outer surfaces where they communicate with the interior surface of the fire pot, the restricted openings being indicated by the numeral 11. This construction is for the purpose of admitting air to the fire around its outer circumference, the fire heating the passageways 10 and the air as it is drawn through them. I

Heretofore, in furnace constructions of this type, the passageways in the wall of the fire pot have terminated abruptly at some distance below the upper edge or rim of the fire pot. This arrangement has directed the heated air directly into the bed of coals. The present invention secures 'a passage of the heated air above the fire and secures a more veflicient combustion. In order to accomplish this purpose the passageways are so designed that they are open at their upper ends and thus discharge the heated air upwardly as well as laterally. This arrangement is clearly shown in Figures 5 and 6 of the drawin It is advisable to provide a slight restriction or closure at the upper ends of the passageways to prevent the entrance of any large particles of coal from above. This arrangement is indicated at 12 where a wall I or ridge is cast at the upper end of each passageway. Small particles of coal which pass through the opening will find their way through the passageways and drop into the ash pit.

In order to form the passageways so that they are open at their upper ends, it is advisable to locate the groove 14, in which the next sect-ion of the furnace seats, outwardly of the fire-pot section and this is done by casting an overhanging ledge or flange 15 in which the groove is formed.

Other embodiments of the invention may be devised within the scope of the invention, as will be understood by those skilled in this art. Such changes as do not affect the broader principles of the invention are intended to be covered herein.

What is claimed is: l 5 V In a furnace construction, a fire pot secion formed with the inner surface curved inwardly and downwardly adjacent the top thereof, passageways formed Within the Wall of the fire pot and opening at their tops through said curved inner surface to direct air above the fire pot, and formations restricting the upper ends of the passageways for preventing the entrance of coal therein.

VVILBERT G. VISE. 

